ozone: Introduce ClientPixmap and ClientPixmapFactory for non-GPU processes.

ui/ozone/platform/drm/host/drm_display_host_manager.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/ozone/platform/drm/host/drm_display_host_manager.h"
 
 #include <fcntl.h>
 #include <xf86drm.h>
 
 #include "base/files/file_enumerator.h"
@@ skipping 137 matching lines @@
   has_dummy_display_ = !display_infos.empty();
   for (size_t i = 0; i < display_infos.size(); ++i) {
     displays_.push_back(new DrmDisplayHost(
         proxy_, CreateDisplaySnapshotParams(display_infos[i],
                                             primary_drm_device_handle_->fd(), i,
                                             gfx::Point()),
         true /* is_dummy */));
   }
 }
 
+base::FileDescriptor DrmDisplayHostManager::DupVgemFd() {
+  if (vgem_card_path_.empty())
+    return base::FileDescriptor();
+
+  int duped_handle = -1;
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    duped_handle = HANDLE_EINTR(dup(vgem_card_device_file_.get()));
+  }
+  if (duped_handle < 0) {
+    PLOG(ERROR) << "dup() failed.";
+    return base::FileDescriptor();
+  }
+
+  return base::FileDescriptor(duped_handle, true);
+}
+
 DrmDisplayHostManager::~DrmDisplayHostManager() {
   device_manager_->RemoveObserver(this);
   proxy_->UnregisterHandler(this);
 }
 
 DrmDisplayHost* DrmDisplayHostManager::GetDisplay(int64_t display_id) {
   auto it = std::find_if(displays_.begin(), displays_.end(),
                          FindDrmDisplayHostById(display_id));
   if (it == displays_.end())
     return nullptr;
@@ skipping 306 matching lines @@
 
   callback.Run(snapshots);
 }
 
 void DrmDisplayHostManager::NotifyDisplayDelegate() const {
   if (delegate_)
     delegate_->OnConfigurationChanged();
 }
 
 }  // namespace ui